# std::layout_left::mapping<Extents>::mapping-traits

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< cpp‎ | container‎ | mdspan‎ | layout left‎ | mapping

static constexpr bool is_unique() noexcept; | (1) | (since C++23)
static constexpr bool is_exhaustive() noexcept; | (2) | (since C++23)
static constexpr bool is_strided() noexcept; | (3) | (since C++23)
static constexpr bool is_always_unique() noexcept; | (4) | (since C++23)
static constexpr bool is_always_exhaustive() noexcept; | (5) | (since C++23)
static constexpr bool is_always_strided() noexcept; | (6) | (since C++23)

Every instance of every specialization of `mapping` is unique, exhaustive, and strided. See LayoutMapping for the semantics of these predicate mapping traits.

### Parameters

(none)

### Return value

1-6) true

### Example

| This section is incomplete Reason: no example

### See also

| This section is incomplete

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